ProgramErgoSum writes: Horse carriages, vinyl records, telegraphy, black and white television are all great examples of technology that held tremendous sway decades ago and eventually faded away. Other systems such as railways and telephony too are 'historical' but have advanced into current age too. I think, not being aware of the science behind such yesteryear technologies (or, its history) is not right. I feel, it would be most beneficial to encourage kids to explore old technologies and perhaps, even try simple simulations at home or school.

So, what websites or videos or other sources of information would you reach out to that teaches the basics of say, telegraphy ? Or, signalling in railways ? Etc. etc.

Indian Railways has been accepting the SMS sent by their reservation system with a valid photo ID as a valid ticket for travel. And, yes, every time I board the train, I can see fewer and fewer passengers showing printed tickets.
https://www.irctc.co.in/VRM.htm/

Most images of Head of States signing something into a law show that person actually signing with ink on paper. Suppose that were to be digital ? Could that set a trend to actually implement paperlessness ?